What is a bed of nails test fixture?

What is a bed of nails test fixture?

A bed of nails tester is a traditional electronic test fixture which has numerous pins inserted into holes in an Epoxy phenolic glass cloth laminated sheet (G-10) which are aligned using tooling pins to make contact with test points on a printed circuit board and are also connected to a measuring unit by wires.

How do pogo pins work?

A basic spring-loaded pin consists of 3 main parts: a plunger, barrel, and spring. When force is applied to the pin, the spring is compressed and the plunger moves inside the barrel. The shape of the barrel retains the plunger, stopping the spring from pushing it out when the pin is not locked in place.

What is ICT and FCT?

The in-circuit test (ICT) involves the measurement of all individual components of an assembly. Defective components are detected and can be replaced if necessary. The function test (FCT) checks an assembly functions 100 percent as intended.

Are pogo pins reliable?

Spring-Loaded pins, sometimes called Spring-Loaded Contacts, Spring probes, or Pogo Pins, provide a highly-reliable, precision made interconnect solution ideal for a number of demanding application requirements in the fast moving world of electronic interconnects.

Why pogo pins are used?

A Pogo pin is a device used in electronics to establish a connection between two printed circuit boards. Pressed between two electronic circuits, the sharp points at each end of the pogo pin make secure contacts with the two circuits and thereby connect them together.

What is the full form of ICT and FCT?

What is a FCT fixture?

A Functional Circuit Test (FCT) fixture is a critical part of quality control in an electronics manufacturing environment. FCT fixtures evaluate a board in a powered on and in application capacity.

How pogo pins are made?

Plunger + Spring + Tube = Pin A Pogo Pin takes the form of a slender cylindrical receptacle containing a sharp, spring-loaded pin. Pressed between two electronic circuits, the sharp points at each end of the pogo pin make secure contacts with the two circuits and thereby connect them together.

Where are pogo pins used?

It usually consists of plunger, tube and spring. Pogo pin is generally applied in the precision connection inside the electronics products such as mobile phones, communication devices, automotive, medical devices, aerospace devices and so on.

What is FCT in PCB?

Functional Test(FCT) is carried out on the assembled PCBs(called PCBA). FCT is the quality control test at the final stage of the production line before shipping the PCBA to the customers. FCT test is low cost and closure to the actual Functionality and Electrical Environment of the board.

How to make a bed of Nails test fixture?

We automated the mechanical design for bed-of-nails test fixtures. FixturFab analyzes ECAD files to automatically identify test points, mounting holes, and other test features. Choose test probe and receptacle types from a list of compatible parts.

What should the pins be on a bed of nails?

These pins on the bed of nails should be conical at the tips and longer than the pogo-pins so the board lines up BEFORE it makes contact with the test pins. I believe pictures are worth a thousand words (?).

How are PCBs laid on a bed of nails?

This project comes to us by way of [Thom] who has been doing a large production run of circuits meant to drive nixie tubes. After the each board is completed, they are laid on top of a number of pins arranged to mate to various points on the PCB.

How are electrical connections made in a bed of nails?

Electrical connections were done with discrete wires point-to-point. These design choices for the bed of nails allowed several useful properties. The holes for the pogo pin sockets had a high aspect ratio, so the pogo pins aligned themselves well in the vertical.